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Oct. 6, 1931. p, DONLE 1,826,305

TELEVISION APPARATUS Filed July 18, 1928 AMPLIFIER Patented Get. 6, 1931.

HanoL-nr. Donna, on

'rntnvrsron Application filed July is,

My invention relates particularly to the reproducing part of the apparatus. In such systems the obyect .Jwhose picture is to be transmitted is sub ected to periodic light 1mpulses which are reflected or fall upon light sensitive means which in turn causes fluctuation in electrical current. The interruptions in the light beam are produced by a disc having a number of openings and rotating at a fixed speed. The reproduction appa dinarily called a constant speed electric mo.-

- tor.

The shaft is formed in two parts and the speed of rotation of one part is manually controlled by friction means and regularized by a ball governor. -The other part of the shaft carries the scanning disc and the angular relation of the two parts of the shaft is adjustable manually controlled means in dependent of the speed controlling means and independent of the speed of the motor.

Fig. 1 is a diagrammatic view showing the edge of a scanning disc and the amplifier and light. i r

Fig. 2 is afront view of a typical form of scanning disc. 7 I I Fig. 3 is a front view of the apparatus embodying: my invention. parts being shown dotted behind the panel hoard or front plate. I

F i is a plan view of one form of apparatns embodying; my invention.

Fig. 5 is a detail sectional view showing; the connection between the two parts of the driving shaft of the scanning disc. 7

In the drawings I have diagrammatically represented thesource of light 10 at the receiving station and an amplifier 11. These may be of any suitable construction as are commonly employed in apparatus of this character.

, C013 EECTICU T arransrns 1928. Serial in. 298,676.

ismountcd behind a panel 1 1 and a sight opening 15 is provided through which the picture is displayed.

7 The disc 1 is mounted upon or driven by a shaft composed of two parts 16 and 17 which are coupled together by a sleeve 18. This cl: ve is provided with two inclined slots 19 e and .20 and the shaft sections 16 and 17 are n'ovided with pins or projections 21 and 22. .vhich loosely fit 1n the slots. This sleeve 18' is maintained adjustably in position with re spect to the longitudinal axis of the shaft sections by an arm 23 and a ballbearing member 24. This member is composed of an inner ring 25,, an outerring 26, and a. series of balls 27. The inner ring 25 is secured to thesleeve, 18 and both rin s are grooved to. provide race ways for the balls 27. I V

The electric motor 30 is suitably mounted and geared in a suitable manner for instance by a belt 31 to a pulley 32 on shaft 17, This motor may be of what is commonly termed a constant speed type. The speed of the'shaft 17 may be regulated to synchronism with the I speed of the shaft of the transmitting mechanism (not shown) by a ball governor 33 and a friction brake. This brake consists of a disc 34 on the shaft 1? and a lever'35 having a foot 36 hearing against the disc 34. The lever is pivoted at 37 and has its outer. end loosely connected to a nut 38 upon the screw threaded shaft The latter has a knob e0 for rotat- 7 ing the shaft 39 and adjusting the friction of the brake so as to control the speed of rotation of the disc. I

The arm or lever 23is pivoted at 41 and has its outer end loosely connected to the nut. 12 on the shaft 43. The latter has an a'djusting knob leby means of which the shaft 43 maybe rotated to move the lever 23 and f shift the coupling ring 24 and sleeve 18 back and forth. I By shifting the sleeve 18 back and forth angular relation of the shaft 16 with respect to that of the shaft 17 maybe i changed so as to in effect advance or retard the disc 12 while it is rotating.

It will thus be seen that the speed of rotation of the disc 12 may be regulated by the knob so to correspond with the speed of rotation of the transmitting disc (for instance not shown). By turning the knob 44 the sleeve 18 may be moved back and forth so as to advance or retard the disc 12 with respect to its shaft and thus bring the individual openings 13 into exact synchronism with the corresponding openings in the transmitting disc.

The holes in the disc may be arranged on a spiral or spirals having a pitch two, three or more times as great as that shown so that the disc may be driven at one half, one third or a. lesser fraction of the speed of the transmit-ting disc. This form is shown in Fig. G where holes 61 form one spiral and holes 62 another spi al, of the disc (30. It is to be noticed that, subject to possible slight overlap, the sum of the angular distances of all the spirals does not substantially exceed 360.

To ensure uniformity in the speed of the scanning disc, the net energy capacity of the disc should bear a rather definite relation to the power of the motor. For instance, with an electric motor of say one sirrtieth of a horse power the disc may be say eight inches in diameter and weigh three and one half pounds. Such a disc may be brought up to a sped of 1200 R. P. M. by such a motor in two minutes.

If the moment of inertia of the disc is very much less it becomes too sensitive to the variation in speed of the motor. If the moment of inertia or fly-wheel effect of the disc is too great it becomes sluggish. and insensitive to the starting and control adjustments. The disc should have an energy storage capacity sufficient to keep it moving at a substantially uniform speed.

It should be understood that the invention is illustrated largely diagrammatically and that various changes in construction and arrangement may be made within the spirit and scope of my invention.

I claim:

1. A television reproduction apparatus comprising a scanning disc, a shaft therefor having two alined parts, controlled means for rotating one part of the shaft relative to the other part and a motor for rotating the other part, a friction disc on the latter part, a controlled brake coacting with said friction disc, a ball governor rotatable with said disc, and a driving connection between said motor and that part of said shaft to which said governor is connected.

2. A television apparatus comprising a two part shaft with the parts in alinement, a sleeve mounted on adjacent ends of said parts, pin and slot connections between said sleeve and said parts, a scanning disc secured to one of said parts, an electric motor geared to the other part of said shaft, controlled means for regulating the speed of the latter part of said shaft and means for rotating said sleeve.

3. A television apparatus comprising a shaft formed of two parts, a scanning disc mounted on one part, an electric motor for driving the other part, controlled friction means for regulating the speed of the latter part, and separately controlled means independent thereof for changing the angular relation of said disc with respect to the motor driven part while the disc is rotated.

41. A television apparatus comprising a two part shaft, a sleeve mounted on adjacent ends of said parts, pin and slot connections between said sleeve and said parts, a scanning disc driven by one of said parts, an elec tric motor geared to the other part of said shaft, and separately controlled means for rotating said sleeve relative to said shaft.

5. A television apparatus comprising a shaft formed of two parts, a scanning disc driven by one part, a motor for driving the other part, controlled means for regulating the speed of the latter part, and controlled means independent thereof for rotating said disc with respect to the motor driven part while the disc is rotating. 

